This is a full walkthrough for the Timestamp Microservice project on freeCodeCamp. We create an express app and set up a route for our API endpoint to take in an input. We can then determine if this input is a date or timestamp and use it to generate an appropriate response JSON. Link to Project : https://www.freecodecamp.org/learn/apis-and-microservices/apis-and-microservices-projects/timestamp-microservice Written Guide and Source Code : https://www.notion.so/ganeshh123/Timestamp-Microservice-02425f5a96a44665af1c259317fde541 Timestamps: 0:00 - Project Setup 02:25 - Setting up the Route 05:10 - Capturing the Input 06:20 - Test 1 - It should handle a valid date, and return the correct unix timestamp 10:28 - Test 2 - It should handle a valid date, and return the correct UTC string 12:06 - Test 3 - It should handle a valid unix date, and return the correct unix timestamp 16:20 - Test 4 - It should return the expected error message for an invalid date 18:30 - Test 5 - It should handle an empty date parameter, and return the current time in unix format 20:58 - Test 6 - It should handle an empty date parameter, and return the current time in UTC format -————————————————————————————————————- Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser. The Node Package Manager (npm) is a command-line tool used by developers to share and control modules (or packages) of JavaScript code written for use with Node.js. Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing. MongoDB is a cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL). Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB. freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum ... https://www.youtube.com/watch?v=Vcxszof5lnw

Mongoose has some methods findOneAndUpdate() and findByIdAndUpdate() that allow us to update records in one step. We pass in a query object to find our desired record, a second object with our desired properties, a third object with an option to return the new record, and finally a callback function. Link to challenge : https://www.freecodecamp.org/learn/apis-and-microservices/mongodb-and-mongoose/perform-new-updates-on-a-document-using-model-findoneandupdate Written Guide : https://www.notion.so/ganeshh123/Perform-New-Updates-on-a-Document-Using-model-findOneAndUpdate-f3fe6ef3689d4eaaae1e875336d37e12 Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1QJMb63oecYZ3lLjrF4PnIs All Writen Guides for this course : https://www.notion.so/ganeshh123/6f987e7260914612b06adf840dbb00c3 All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26 Concepts: model.findOneAndUpdate() Issues a mongodb findAndModify update command. Finds a matching document, updates it according to the update arg, passing any options, and returns the found document (if any) to the callback. The query executes if callback is passed else a Query object is returned. https://mongoosejs.com/docs/api/model.html#model_Model.findOneAndUpdate model.findByIdAndUpdate() Issues a mongodb findAndModify update command by a document's _id field. findByIdAndUpdate(id, ...) is equivalent to findOneAndUpdate({ _id: id }, ...). Finds a matching document, updates it according to the update arg, passing any options, and returns the found document (if any) to the callback. The query executes if callback is passed. https://mongoosejs.com/docs/api/model.html#model_Model.findByIdAndUpdate Model Models are fancy constructors compiled from Schema definitions. An instance of a model is called a document. Models are responsible for creating and reading documents from the underlying MongoDB database. https://mongoosejs.com/docs/models.html -————————————————————————————————————- MongoDB is a cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL). Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB. freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publ ... https://www.youtube.com/watch?v=1UnZyC25pt4